Official photos have been tweaked all the way down the decades - to flatter the sitter, of course. It started back in the reign of Queen Victoria, when portraits of her vast family included bits of collage.
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It was no doubt intended to silence the wagging tongues and conspiracy theorists. But a photograph released by Kensington Palace on Mothering Sunday, showing the Princess of Wales looking happy and healthy with her children after a period of absence from the public eye, had the opposite effect.